monozygotic twins are genetically identical individuals who can also be mirror image twins and the differences between them result from environmental factors. current study, monozygotic twins were analyzed in different dentitions of primary, mixed and permanent. as a conclusion, although genetic factors are naturally potent, environmental factors’ role can be increased and weaken the genetic fa...

cystic fibrosis is an inheritant autosomal recessive disease. it is associated with mutations in cystic fibrosis trans regulator gene (cftr) and has different presentations.we report two 2 month old female patients, products of a twin delivery presented with anemia, edema, hypoalbuminemia and pneumonia.after some work ups, diagnosis of cystic fibrosis was confirmed. this is an uncommon and inte...

background: monozygotic monochorionic triplet pregnancy with conjoined twins is a very rare condition and is associated with many complications. case: in this study, we describe a monochorionic–diamniotic triplet pregnancy after in vitro fertilization with an intracytoplasmic sperm injection. at a gestational age of 6 weeks and 4 days of pregnancy one gestational sac was observed, and at a gest...

Twin investigation has played a major role in the history of human genetics. The present cross-sectional study was undertaken on 50 pairs of monozygotic and dizygotic (8 monozygotic and 42 dizygotic) aged 7-67 years in Amritsar district in Punjab. Results from twin studies indicate that all the means of height, weight, systolic blood pressure, diastolic blood pressure, waist circumference, hip ...

BACKGROUND It is estimated that there is at least a 2-fold rise in the incidence of monozygotic twinning after assisted reproductive technology compared with natural conception. This can result in adverse pregnancy outcomes. METHODS We searched MEDLINE, EMBASE and SCISEARCH for studies that estimated the risk of monozygotic twinning and its association with any particular assisted reproductiv...

the present report aimed to study an uncommon case of a pair of twins that presented a discordant dental phenotype. family investigation, clinical, radiographic examination and molecular analysis were performed in both girls. molecular analysis confirmed the monozygosity by deoxyribonucleic acid chip technology. one twin presented tooth agenesis in left upper lateral incisor and peg-shaped on t...

The problem of zygosity misclassification of twins has been paid little attention in Japan. By analyzing maternal reports collected using an internet questionnaire, the author found that around 30% of monozygotic twins were misclassified as dizygotic twins, mainly by obstetricians. On the other hand, the percentage of dizygotic twin pairs misclassified as monozygotic twins was lower. Misclassif...